All eyes on 787’s Batteries, this time an Air Pressure Sensor.

This Sunday, a Japan Airlines’ Boeing 787 experienced a problem with an air pressure sensor for its battery container.

The incident occurred with an aircraft scheduled to fly from Tokyo to Beijing and it happened just a day after JAL and All Nippon Airways resumed regular flights using 787’s.

JAL said the problem was found during a maintenance safety check prior to the flight.

The pressure sensor for the battery container in the electrical equipment bay at the back of the aircraft showed a difference in air between outside and inside the container.JAL said there was no abnormality with the battery itself.

According to the airline spokesperson, Boeing may have caused the problem through faulty maintenance, as two small holes in the container were mistakenly sealed during repairs to the battery system. The holes are necessary for air ventilation to prevent overheating, JAL said.

Among other airlines, JAL 787’s were grounded for more than four months due to a series of battery problems, the root cause of the battery defect has yet to be identified.